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DES-7200 Configuration Guide Chapter 1 IP Address and Service
Configuration
1-8
broadcast packet. However, the node that generates this packet is not a
member of the destination subnet.
Upon the receipt of directed broadcast IP packets, the device indirectly
connecting the destination subnet will forward the packets in the same way as
forwarding unicast packets. After the directed broadcast IP packets arrive the
device directly connecting the subnet, the device transforms them into flooding
broadcast IP packets (whose destination address is all 1s in general), and then
send them to all the hosts within the subnet by means of broadcast on the link
layer.
Enabling directed broadcast to physical broadcast translation on an interface
allows the itnerface to forward the directed broadcast IP packets to the directly
connected network. This command will only affect the transmission of the
directed broadcast IP packets to the final destination subnet, not other directed
broadcasts.
You can forward directed broadcast IP packets as required an interface by
defining ACLs. Only those IP packets matching the ACLs are translated from
directed broadcasts to physical broadcasts.
To configure the directed broadcast-to-physical broadcast translation, execute
the following command in the interface configuration mode:
Command Function
DES-7200(config-if)# ip
directed-broadcast
[access-list-number]
Enable directed broadcast to physical
broadcast translation on the interface.
DES-7200(config-if)# no ip
directed-broadcast
Disable the translation.
1.1.2.4.2 Establishing an IP Broadcast Address
Currently, the most popular way is the destination address consisting of all 1s
(255.255.255.255). DES-7200 product can be configured to generate any form
of IP broadcast address and receive any form of IP broadcast packets.
To set a broadcast IP address other than 255.255.255.255, execute the
following command in the interface configuration mode:
Command Function
DES-7200(config-if)# ip
broadcast-address ip-address
Create a broadcast address.
DES-7200(config-if)# no ip
broadcast-address
Remove the configuration.